Milwaukee County Sheriff David Clarke spoke at the 2016 Republican National Convention in Cleveland. (AP Photo/J. Scott Applewhite)

Milwaukee County Sheriff David A. Clarke, Jr. has withdrawn his name from consideration for an assistant secretary position at the Department of Homeland Security, an adviser to Clarke confirmed to The Washington Post on Saturday.

"Late Friday, Milwaukee County Sheriff David Clarke Jr. formally notified Secretary of Homeland Security John F. Kelly that he had rescinded his acceptance of the agency’s offer to join DHS as an assistant secretary," said Craig Peterson, an adviser to Clarke. "Sheriff Clarke is 100 percent committed to the success of President Trump and believes his skills could be better utilized to promote the president’s agenda in a more aggressive role."

Clarke was expected to start in a role at DHS at the end of June, but according to one person close to the administration who is familiar with the situation, his appointment had been subject to significant delays that contributed to his withdrawal.

Clarke, a vocal supporter of Trump during the 2016 campaign, is also a controversial figure. He was accused of plagiarism, and has drawn scrutiny for conditions in his jails that left one mentally ill inmate dead.

A spokesman for the Department of Homeland Security said: "Sheriff Clarke is no longer being considered for a position within DHS. We wish him well."

Milwaukee County Sheriff David Clarke offered his support for police officers around the country during a speech on the opening day of the Republican National Convention on July 18. (The Washington Post)

Trump and Clarke met in Wisconsin on Tuesday, according to Peterson, and they discussed other roles in which Clarke could support Trump.

"The sheriff is reviewing options inside and outside of government," Peterson said. "Sheriff Clarke told Secretary Kelly he is very appreciative of the tremendous opportunity the secretary was offering, and expressed his support for the secretary and the agency."

The Washington Post obtained a copy of the tentative job offer letter from the Department of Homeland Security offering Clarke the Assistant Secretary for Office of Partnership and Engagement/State and Local Law Enforcement position. The letter states that Clarke's position would be subject to final approval by the Office of Personnel Management.

The White House did not immediately respond to requests for comment.